It's a JSON parser written in UnityScript ("UnityJS"). I found JSONParse which was really good but I was expecting some other features. JSONUtils is a JSON parser which allow some other things like serialize to JSON for some data types like Hashtable, Array, numbers, booleans and strings.

The first and more important thing : this script parse JSON "object" into Hashtable, not Object.
Some functions let you serialize your data into JSON if it contains only following data types : Array, Object, Hashtable, number (int, float, double), boolean or String.